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</pre><pre class="rust ">
<span class="comment">// Copyright 2016 Amanieu d&#39;Antras</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0, &lt;LICENSE-APACHE or</span>
<span class="comment">// http://apache.org/licenses/LICENSE-2.0&gt; or the MIT license &lt;LICENSE-MIT or</span>
<span class="comment">// http://opensource.org/licenses/MIT&gt;, at your option. This file may not be</span>
<span class="comment">// copied, modified, or distributed except according to those terms.</span>

<span class="doccomment">//! Per-object thread-local storage</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This library provides the `ThreadLocal` type which allows a separate copy of</span>
<span class="doccomment">//! an object to be used for each thread. This allows for per-object</span>
<span class="doccomment">//! thread-local storage, unlike the standard library&#39;s `thread_local!` macro</span>
<span class="doccomment">//! which only allows static thread-local storage.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Per-thread objects are not destroyed when a thread exits. Instead, objects</span>
<span class="doccomment">//! are only destroyed when the `ThreadLocal` containing them is destroyed.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! You can also iterate over the thread-local values of all thread in a</span>
<span class="doccomment">//! `ThreadLocal` object using the `iter_mut` and `into_iter` methods. This can</span>
<span class="doccomment">//! only be done if you have mutable access to the `ThreadLocal` object, which</span>
<span class="doccomment">//! guarantees that you are the only thread currently accessing it.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A `CachedThreadLocal` type is also provided which wraps a `ThreadLocal` but</span>
<span class="doccomment">//! also uses a special fast path for the first thread that writes into it. The</span>
<span class="doccomment">//! fast path has very low overhead (&lt;1ns per access) while keeping the same</span>
<span class="doccomment">//! performance as `ThreadLocal` for other threads.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Note that since thread IDs are recycled when a thread exits, it is possible</span>
<span class="doccomment">//! for one thread to retrieve the object of another thread. Since this can only</span>
<span class="doccomment">//! occur after a thread has exited this does not lead to any race conditions.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Basic usage of `ThreadLocal`:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! use thread_local::ThreadLocal;</span>
<span class="doccomment">//! let tls: ThreadLocal&lt;u32&gt; = ThreadLocal::new();</span>
<span class="doccomment">//! assert_eq!(tls.get(), None);</span>
<span class="doccomment">//! assert_eq!(tls.get_or(|| Box::new(5)), &amp;5);</span>
<span class="doccomment">//! assert_eq!(tls.get(), Some(&amp;5));</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Combining thread-local values into a single result:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! use thread_local::ThreadLocal;</span>
<span class="doccomment">//! use std::sync::Arc;</span>
<span class="doccomment">//! use std::cell::Cell;</span>
<span class="doccomment">//! use std::thread;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let tls = Arc::new(ThreadLocal::new());</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Create a bunch of threads to do stuff</span>
<span class="doccomment">//! for _ in 0..5 {</span>
<span class="doccomment">//!     let tls2 = tls.clone();</span>
<span class="doccomment">//!     thread::spawn(move || {</span>
<span class="doccomment">//!         // Increment a counter to count some event...</span>
<span class="doccomment">//!         let cell = tls2.get_or(|| Box::new(Cell::new(0)));</span>
<span class="doccomment">//!         cell.set(cell.get() + 1);</span>
<span class="doccomment">//!     }).join().unwrap();</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Once all threads are done, collect the counter values and return the</span>
<span class="doccomment">//! // sum of all thread-local counter values.</span>
<span class="doccomment">//! let tls = Arc::try_unwrap(tls).unwrap();</span>
<span class="doccomment">//! let total = tls.into_iter().fold(0, |x, y| x + y.get());</span>
<span class="doccomment">//! assert_eq!(total, 5);</span>
<span class="doccomment">//! ```</span>

<span class="attribute">#<span class="op">!</span>[<span class="ident">warn</span>(<span class="ident">missing_docs</span>)]</span>

<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">thread_id</span>;

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Mutex</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">UnsafeCell</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>::<span class="ident">Chain</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">option</span>::<span class="ident">IntoIter</span> <span class="kw">as</span> <span class="ident">OptionIter</span>;

<span class="comment">// Option::unchecked_unwrap</span>
<span class="kw">trait</span> <span class="ident">UncheckedOptionExt</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">unchecked_unwrap</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">T</span>;
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">unreachable</span>() <span class="op">-&gt;</span> <span class="op">!</span> {
    <span class="kw">enum</span> <span class="ident">Void</span> {}
    <span class="kw">match</span> <span class="kw-2">*</span>(<span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Void</span>) {}
}
<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="ident">UncheckedOptionExt</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">unchecked_unwrap</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">T</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=&gt;</span> <span class="ident">x</span>,
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="ident">unreachable</span>(),
        }
    }
}
<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">&gt;</span> <span class="ident">UncheckedOptionExt</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">&gt;</span> {
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">unchecked_unwrap</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">T</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=&gt;</span> <span class="ident">x</span>,
            <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="ident">unreachable</span>(),
        }
    }
}

<span class="comment">// BoxExt::{from_raw,into_raw}</span>
<span class="kw">trait</span> <span class="ident">BoxExt</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">into_raw</span>(<span class="ident">b</span>: <span class="self">Self</span>) <span class="op">-&gt;</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>;
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw</span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="self">Self</span>;
}
<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> <span class="ident">BoxExt</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">into_raw</span>(<span class="kw-2">mut</span> <span class="ident">b</span>: <span class="self">Self</span>) <span class="op">-&gt;</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
        <span class="kw">let</span> <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">b</span>;
        <span class="ident">mem</span>::<span class="ident">forget</span>(<span class="ident">b</span>);
        <span class="ident">ptr</span>
    }
    <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw</span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="self">Self</span> {
        <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">raw</span>)
    }
}

<span class="doccomment">/// Thread-local variable wrapper</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See the [module-level documentation](index.html) for more.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> {
    <span class="comment">// Pointer to the current top-level hash table</span>
    <span class="ident">table</span>: <span class="ident">AtomicPtr</span><span class="op">&lt;</span><span class="ident">Table</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span>,

    <span class="comment">// Lock used to guard against concurrent modifications. This is only taken</span>
    <span class="comment">// while writing to the table, not when reading from it. This also guards</span>
    <span class="comment">// the counter for the total number of values in the hash table.</span>
    <span class="ident">lock</span>: <span class="ident">Mutex</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,

    <span class="comment">// PhantomData to indicate that we logically own T</span>
    <span class="ident">marker</span>: <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
}

<span class="kw">struct</span> <span class="ident">Table</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> {
    <span class="comment">// Hash entries for the table</span>
    <span class="ident">entries</span>: <span class="ident">Box</span><span class="op">&lt;</span>[<span class="ident">TableEntry</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>]<span class="op">&gt;</span>,

    <span class="comment">// Number of bits used for the hash function</span>
    <span class="ident">hash_bits</span>: <span class="ident">usize</span>,

    <span class="comment">// Previous table, half the size of the current one</span>
    <span class="ident">prev</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Table</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span><span class="op">&gt;</span>,
}

<span class="kw">struct</span> <span class="ident">TableEntry</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> {
    <span class="comment">// Current owner of this entry, or 0 if this is an empty entry</span>
    <span class="ident">owner</span>: <span class="ident">AtomicUsize</span>,

    <span class="comment">// The object associated with this entry. This is only ever accessed by the</span>
    <span class="comment">// owner of the entry.</span>
    <span class="ident">data</span>: <span class="ident">UnsafeCell</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span><span class="op">&gt;</span>,
}

<span class="comment">// ThreadLocal is always Sync, even if T isn&#39;t</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-&gt;</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">ThreadLocal</span>::<span class="ident">new</span>()
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw">unsafe</span> {
            <span class="kw">let</span> _: <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Table</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span> <span class="op">=</span> <span class="ident">BoxExt</span>::<span class="ident">from_raw</span>(<span class="self">self</span>.<span class="ident">table</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>));
        }
    }
}

<span class="comment">// Implementation of Clone for TableEntry, needed to make vec![] work</span>
<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">TableEntry</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">TableEntry</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">TableEntry</span> {
            <span class="ident">owner</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>),
            <span class="ident">data</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="prelude-val">None</span>),
        }
    }
}

<span class="comment">// Hash function for the thread id</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">&quot;32&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">hash</span>(<span class="ident">id</span>: <span class="ident">usize</span>, <span class="ident">bits</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="ident">id</span>.<span class="ident">wrapping_mul</span>(<span class="number">0x9E3779B9</span>) <span class="op">&gt;&gt;</span> (<span class="number">32</span> <span class="op">-</span> <span class="ident">bits</span>)
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">&quot;64&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">hash</span>(<span class="ident">id</span>: <span class="ident">usize</span>, <span class="ident">bits</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="ident">id</span>.<span class="ident">wrapping_mul</span>(<span class="number">0x9E3779B97F4A7C15</span>) <span class="op">&gt;&gt;</span> (<span class="number">64</span> <span class="op">-</span> <span class="ident">bits</span>)
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Creates a new empty `ThreadLocal`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">entry</span> <span class="op">=</span> <span class="ident">TableEntry</span> {
            <span class="ident">owner</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>),
            <span class="ident">data</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="prelude-val">None</span>),
        };
        <span class="kw">let</span> <span class="ident">table</span> <span class="op">=</span> <span class="ident">Table</span> {
            <span class="ident">entries</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">entry</span>; <span class="number">2</span>].<span class="ident">into_boxed_slice</span>(),
            <span class="ident">hash_bits</span>: <span class="number">1</span>,
            <span class="ident">prev</span>: <span class="prelude-val">None</span>,
        };
        <span class="ident">ThreadLocal</span> {
            <span class="ident">table</span>: <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="ident">BoxExt</span>::<span class="ident">into_raw</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">table</span>))),
            <span class="ident">lock</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="number">0</span>),
            <span class="ident">marker</span>: <span class="ident">PhantomData</span>,
        }
    }

    <span class="doccomment">/// Returns the element for the current thread, if it exists.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">thread_id</span>::<span class="ident">get</span>();
        <span class="self">self</span>.<span class="ident">get_fast</span>(<span class="ident">id</span>)
    }

    <span class="doccomment">/// Returns the element for the current thread, or creates it if it doesn&#39;t</span>
    <span class="doccomment">/// exist.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_or</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">create</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">T</span>
        <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-&gt;</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>
    {
        <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">get_or_try</span>(<span class="op">||</span> <span class="prelude-val">Ok</span>::<span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, ()<span class="op">&gt;</span>(<span class="ident">create</span>())).<span class="ident">unchecked_unwrap</span>() }
    }

    <span class="doccomment">/// Returns the element for the current thread, or creates it if it doesn&#39;t</span>
    <span class="doccomment">/// exist. If `create` fails, that error is returned and no element is</span>
    <span class="doccomment">/// added.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_or_try</span><span class="op">&lt;</span><span class="ident">F</span>, <span class="ident">E</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">create</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident">E</span><span class="op">&gt;</span>
    {
        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">thread_id</span>::<span class="ident">get</span>();
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">get_fast</span>(<span class="ident">id</span>) {
            <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">x</span>),
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">id</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">create</span>()), <span class="bool-val">true</span>)),
        }
    }

    <span class="comment">// Simple hash table lookup function</span>
    <span class="kw">fn</span> <span class="ident">lookup</span>(<span class="ident">id</span>: <span class="ident">usize</span>, <span class="ident">table</span>: <span class="kw-2">&amp;</span><span class="ident">Table</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">UnsafeCell</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span><span class="op">&gt;&gt;</span> {
        <span class="comment">// Because we use a Mutex to prevent concurrent modifications (but not</span>
        <span class="comment">// reads) of the hash table, we can avoid any memory barriers here. No</span>
        <span class="comment">// elements between our hash bucket and our value can have been modified</span>
        <span class="comment">// since we inserted our thread-local value into the table.</span>
        <span class="kw">for</span> <span class="ident">entry</span> <span class="kw">in</span> <span class="ident">table</span>.<span class="ident">entries</span>.<span class="ident">iter</span>().<span class="ident">cycle</span>().<span class="ident">skip</span>(<span class="ident">hash</span>(<span class="ident">id</span>, <span class="ident">table</span>.<span class="ident">hash_bits</span>)) {
            <span class="kw">let</span> <span class="ident">owner</span> <span class="op">=</span> <span class="ident">entry</span>.<span class="ident">owner</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);
            <span class="kw">if</span> <span class="ident">owner</span> <span class="op">==</span> <span class="ident">id</span> {
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">entry</span>.<span class="ident">data</span>);
            }
            <span class="kw">if</span> <span class="ident">owner</span> <span class="op">==</span> <span class="number">0</span> {
                <span class="kw">return</span> <span class="prelude-val">None</span>;
            }
        }
        <span class="macro">unreachable</span><span class="macro">!</span>();
    }

    <span class="comment">// Fast path: try to find our thread in the top-level hash table</span>
    <span class="kw">fn</span> <span class="ident">get_fast</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">table</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">table</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>) };
        <span class="kw">match</span> <span class="self">Self</span>::<span class="ident">lookup</span>(<span class="ident">id</span>, <span class="ident">table</span>) {
            <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=&gt;</span> <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>((<span class="kw-2">*</span><span class="ident">x</span>.<span class="ident">get</span>()).<span class="ident">as_ref</span>().<span class="ident">unchecked_unwrap</span>()) },
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">get_slow</span>(<span class="ident">id</span>, <span class="ident">table</span>),
        }
    }

    <span class="comment">// Slow path: try to find our thread in the other hash tables, and then</span>
    <span class="comment">// move it to the top-level hash table.</span>
    <span class="attribute">#[<span class="ident">cold</span>]</span>
    <span class="kw">fn</span> <span class="ident">get_slow</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">usize</span>, <span class="ident">table_top</span>: <span class="kw-2">&amp;</span><span class="ident">Table</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">current</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">table_top</span>.<span class="ident">prev</span>;
        <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">table</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">current</span> {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="self">Self</span>::<span class="ident">lookup</span>(<span class="ident">id</span>, <span class="ident">table</span>) {
                <span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="kw">unsafe</span> { (<span class="kw-2">*</span><span class="ident">x</span>.<span class="ident">get</span>()).<span class="ident">take</span>().<span class="ident">unchecked_unwrap</span>() };
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">id</span>, <span class="ident">data</span>, <span class="bool-val">false</span>));
            }
            <span class="ident">current</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">table</span>.<span class="ident">prev</span>;
        }
        <span class="prelude-val">None</span>
    }

    <span class="attribute">#[<span class="ident">cold</span>]</span>
    <span class="kw">fn</span> <span class="ident">insert</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">usize</span>, <span class="ident">data</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident">new</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">T</span> {
        <span class="comment">// Lock the Mutex to ensure only a single thread is modify the hash</span>
        <span class="comment">// table at once.</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
        <span class="kw">if</span> <span class="ident">new</span> {
            <span class="kw-2">*</span><span class="ident">count</span> <span class="op">+=</span> <span class="number">1</span>;
        }
        <span class="kw">let</span> <span class="ident">table_raw</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">table</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);
        <span class="kw">let</span> <span class="ident">table</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">table_raw</span> };

        <span class="comment">// If the current top-level hash table is more than 75% full, add a new</span>
        <span class="comment">// level with 2x the capacity. Elements will be moved up to the new top</span>
        <span class="comment">// level table as they are accessed.</span>
        <span class="kw">let</span> <span class="ident">table</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">count</span> <span class="op">&gt;</span> <span class="ident">table</span>.<span class="ident">entries</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="number">3</span> <span class="op">/</span> <span class="number">4</span> {
            <span class="kw">let</span> <span class="ident">entry</span> <span class="op">=</span> <span class="ident">TableEntry</span> {
                <span class="ident">owner</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>),
                <span class="ident">data</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="prelude-val">None</span>),
            };
            <span class="kw">let</span> <span class="ident">new_table</span> <span class="op">=</span> <span class="ident">BoxExt</span>::<span class="ident">into_raw</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">Table</span> {
                <span class="ident">entries</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">entry</span>; <span class="ident">table</span>.<span class="ident">entries</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="number">2</span>].<span class="ident">into_boxed_slice</span>(),
                <span class="ident">hash_bits</span>: <span class="ident">table</span>.<span class="ident">hash_bits</span> <span class="op">+</span> <span class="number">1</span>,
                <span class="ident">prev</span>: <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="ident">BoxExt</span>::<span class="ident">from_raw</span>(<span class="ident">table_raw</span>)) },
            }));
            <span class="self">self</span>.<span class="ident">table</span>.<span class="ident">store</span>(<span class="ident">new_table</span>, <span class="ident">Ordering</span>::<span class="ident">Release</span>);
            <span class="kw">unsafe</span> { <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">new_table</span> }
        } <span class="kw">else</span> {
            <span class="ident">table</span>
        };

        <span class="comment">// Insert the new element into the top-level hash table</span>
        <span class="kw">for</span> <span class="ident">entry</span> <span class="kw">in</span> <span class="ident">table</span>.<span class="ident">entries</span>.<span class="ident">iter</span>().<span class="ident">cycle</span>().<span class="ident">skip</span>(<span class="ident">hash</span>(<span class="ident">id</span>, <span class="ident">table</span>.<span class="ident">hash_bits</span>)) {
            <span class="kw">let</span> <span class="ident">owner</span> <span class="op">=</span> <span class="ident">entry</span>.<span class="ident">owner</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);
            <span class="kw">if</span> <span class="ident">owner</span> <span class="op">==</span> <span class="number">0</span> {
                <span class="kw">unsafe</span> {
                    <span class="ident">entry</span>.<span class="ident">owner</span>.<span class="ident">store</span>(<span class="ident">id</span>, <span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);
                    <span class="kw-2">*</span><span class="ident">entry</span>.<span class="ident">data</span>.<span class="ident">get</span>() <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">data</span>);
                    <span class="kw">return</span> (<span class="kw-2">*</span><span class="ident">entry</span>.<span class="ident">data</span>.<span class="ident">get</span>()).<span class="ident">as_ref</span>().<span class="ident">unchecked_unwrap</span>();
                }
            }
            <span class="kw">if</span> <span class="ident">owner</span> <span class="op">==</span> <span class="ident">id</span> {
                <span class="comment">// This can happen if create() inserted a value into this</span>
                <span class="comment">// ThreadLocal between our calls to get_fast() and insert(). We</span>
                <span class="comment">// just return the existing value and drop the newly-allocated</span>
                <span class="comment">// Box.</span>
                <span class="kw">unsafe</span> {
                    <span class="kw">return</span> (<span class="kw-2">*</span><span class="ident">entry</span>.<span class="ident">data</span>.<span class="ident">get</span>()).<span class="ident">as_ref</span>().<span class="ident">unchecked_unwrap</span>();
                }
            }
        }
        <span class="macro">unreachable</span><span class="macro">!</span>();
    }

    <span class="doccomment">/// Returns a mutable iterator over the local values of all threads.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Since this call borrows the `ThreadLocal` mutably, this operation can</span>
    <span class="doccomment">/// be done safely---the mutable borrow statically guarantees no other</span>
    <span class="doccomment">/// threads are currently accessing their associated values.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter_mut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">raw</span> <span class="op">=</span> <span class="ident">RawIter</span> {
            <span class="ident">remaining</span>: <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>(),
            <span class="ident">index</span>: <span class="number">0</span>,
            <span class="ident">table</span>: <span class="self">self</span>.<span class="ident">table</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>),
        };
        <span class="ident">IterMut</span> {
            <span class="ident">raw</span>: <span class="ident">raw</span>,
            <span class="ident">marker</span>: <span class="ident">PhantomData</span>,
        }
    }

    <span class="doccomment">/// Removes all thread-specific values from the `ThreadLocal`, effectively</span>
    <span class="doccomment">/// reseting it to its original state.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Since this call borrows the `ThreadLocal` mutably, this operation can</span>
    <span class="doccomment">/// be done safely---the mutable borrow statically guarantees no other</span>
    <span class="doccomment">/// threads are currently accessing their associated values.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="ident">ThreadLocal</span>::<span class="ident">new</span>();
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;
    <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">raw</span> <span class="op">=</span> <span class="ident">RawIter</span> {
            <span class="ident">remaining</span>: <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>(),
            <span class="ident">index</span>: <span class="number">0</span>,
            <span class="ident">table</span>: <span class="self">self</span>.<span class="ident">table</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>),
        };
        <span class="ident">IntoIter</span> {
            <span class="ident">raw</span>: <span class="ident">raw</span>,
            <span class="ident">_thread_local</span>: <span class="self">self</span>,
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;
    <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">iter_mut</span>()
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Default</span><span class="op">&gt;</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Returns the element for the current thread, or creates a default one if</span>
    <span class="doccomment">/// it doesn&#39;t exist.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_default</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">T</span> {
        <span class="self">self</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">T</span>::<span class="ident">default</span>()))
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;ThreadLocal {{ local_data: {:?} }}&quot;</span>, <span class="self">self</span>.<span class="ident">get</span>())
    }
}

<span class="kw">struct</span> <span class="ident">RawIter</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> {
    <span class="ident">remaining</span>: <span class="ident">usize</span>,
    <span class="ident">index</span>: <span class="ident">usize</span>,
    <span class="ident">table</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Table</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">RawIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">remaining</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }

        <span class="kw">loop</span> {
            <span class="kw">let</span> <span class="ident">entries</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&amp;</span>(<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">table</span>).<span class="ident">entries</span>[..] };
            <span class="kw">while</span> <span class="self">self</span>.<span class="ident">index</span> <span class="op">&lt;</span> <span class="ident">entries</span>.<span class="ident">len</span>() {
                <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="ident">entries</span>[<span class="self">self</span>.<span class="ident">index</span>].<span class="ident">data</span>.<span class="ident">get</span>();
                <span class="self">self</span>.<span class="ident">index</span> <span class="op">+=</span> <span class="number">1</span>;
                <span class="kw">if</span> <span class="kw">unsafe</span> { (<span class="kw-2">*</span><span class="ident">val</span>).<span class="ident">is_some</span>() } {
                    <span class="self">self</span>.<span class="ident">remaining</span> <span class="op">-=</span> <span class="number">1</span>;
                    <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">val</span>);
                }
            }
            <span class="self">self</span>.<span class="ident">index</span> <span class="op">=</span> <span class="number">0</span>;
            <span class="self">self</span>.<span class="ident">table</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="kw-2">*</span>(<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">table</span>).<span class="ident">prev</span>.<span class="ident">as_ref</span>().<span class="ident">unchecked_unwrap</span>() };
        }
    }
}

<span class="doccomment">/// Mutable iterator over the contents of a `ThreadLocal`.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="ident">raw</span>: <span class="ident">RawIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    <span class="ident">marker</span>: <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span> {
        <span class="self">self</span>.<span class="ident">raw</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="kw">unsafe</span> { (<span class="kw-2">*</span><span class="ident">x</span>).<span class="ident">as_mut</span>().<span class="ident">unchecked_unwrap</span>() })
    }

    <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
        (<span class="self">self</span>.<span class="ident">raw</span>.<span class="ident">remaining</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">raw</span>.<span class="ident">remaining</span>))
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {}

<span class="doccomment">/// An iterator that moves out of a `ThreadLocal`.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> {
    <span class="ident">raw</span>: <span class="ident">RawIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
    <span class="ident">_thread_local</span>: <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span> {
        <span class="self">self</span>.<span class="ident">raw</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="kw">unsafe</span> { (<span class="kw-2">*</span><span class="ident">x</span>).<span class="ident">take</span>().<span class="ident">unchecked_unwrap</span>() })
    }

    <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>) {
        (<span class="self">self</span>.<span class="ident">raw</span>.<span class="ident">remaining</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">raw</span>.<span class="ident">remaining</span>))
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {}

<span class="doccomment">/// Wrapper around `ThreadLocal` which adds a fast path for a single thread.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This has the same API as `ThreadLocal`, but will register the first thread</span>
<span class="doccomment">/// that sets a value as its owner. All accesses by the owner will go through</span>
<span class="doccomment">/// a special fast path which is much faster than the normal `ThreadLocal` path.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> {
    <span class="ident">owner</span>: <span class="ident">AtomicUsize</span>,
    <span class="ident">local</span>: <span class="ident">UnsafeCell</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span><span class="op">&gt;</span>,
    <span class="ident">global</span>: <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>,
}

<span class="comment">// CachedThreadLocal is always Sync, even if T isn&#39;t</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-&gt;</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">CachedThreadLocal</span>::<span class="ident">new</span>()
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Creates a new empty `CachedThreadLocal`.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">CachedThreadLocal</span> {
            <span class="ident">owner</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>),
            <span class="ident">local</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="prelude-val">None</span>),
            <span class="ident">global</span>: <span class="ident">ThreadLocal</span>::<span class="ident">new</span>(),
        }
    }

    <span class="doccomment">/// Returns the element for the current thread, if it exists.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">thread_id</span>::<span class="ident">get</span>();
        <span class="kw">let</span> <span class="ident">owner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">owner</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);
        <span class="kw">if</span> <span class="ident">owner</span> <span class="op">==</span> <span class="ident">id</span> {
            <span class="kw">return</span> <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>((<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">local</span>.<span class="ident">get</span>()).<span class="ident">as_ref</span>().<span class="ident">unchecked_unwrap</span>()) };
        }
        <span class="kw">if</span> <span class="ident">owner</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="kw">return</span> <span class="prelude-val">None</span>;
        }
        <span class="self">self</span>.<span class="ident">global</span>.<span class="ident">get_fast</span>(<span class="ident">id</span>)
    }

    <span class="doccomment">/// Returns the element for the current thread, or creates it if it doesn&#39;t</span>
    <span class="doccomment">/// exist.</span>
    <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_or</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">create</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">T</span>
        <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-&gt;</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>
    {
        <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">get_or_try</span>(<span class="op">||</span> <span class="prelude-val">Ok</span>::<span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, ()<span class="op">&gt;</span>(<span class="ident">create</span>())).<span class="ident">unchecked_unwrap</span>() }
    }

    <span class="doccomment">/// Returns the element for the current thread, or creates it if it doesn&#39;t</span>
    <span class="doccomment">/// exist. If `create` fails, that error is returned and no element is</span>
    <span class="doccomment">/// added.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_or_try</span><span class="op">&lt;</span><span class="ident">F</span>, <span class="ident">E</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">create</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident">E</span><span class="op">&gt;</span>
    {
        <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="ident">thread_id</span>::<span class="ident">get</span>();
        <span class="kw">let</span> <span class="ident">owner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">owner</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);
        <span class="kw">if</span> <span class="ident">owner</span> <span class="op">==</span> <span class="ident">id</span> {
            <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="kw">unsafe</span> { (<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">local</span>.<span class="ident">get</span>()).<span class="ident">as_ref</span>().<span class="ident">unchecked_unwrap</span>() });
        }
        <span class="self">self</span>.<span class="ident">get_or_try_slow</span>(<span class="ident">id</span>, <span class="ident">owner</span>, <span class="ident">create</span>)
    }

    <span class="attribute">#[<span class="ident">cold</span>]</span>
    <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
    <span class="kw">fn</span> <span class="ident">get_or_try_slow</span><span class="op">&lt;</span><span class="ident">F</span>, <span class="ident">E</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">id</span>: <span class="ident">usize</span>, <span class="ident">owner</span>: <span class="ident">usize</span>, <span class="ident">create</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident">E</span><span class="op">&gt;</span>
    {
        <span class="kw">if</span> <span class="ident">owner</span> <span class="op">==</span> <span class="number">0</span> <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">owner</span>.<span class="ident">compare_and_swap</span>(<span class="number">0</span>, <span class="ident">id</span>, <span class="ident">Ordering</span>::<span class="ident">Relaxed</span>) <span class="op">==</span> <span class="number">0</span> {
            <span class="kw">unsafe</span> {
                (<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">local</span>.<span class="ident">get</span>()) <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">create</span>()));
                <span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">local</span>.<span class="ident">get</span>()).<span class="ident">as_ref</span>().<span class="ident">unchecked_unwrap</span>());
            }
        }
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">global</span>.<span class="ident">get_fast</span>(<span class="ident">id</span>) {
            <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">x</span>),
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">global</span>.<span class="ident">insert</span>(<span class="ident">id</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">create</span>()), <span class="bool-val">true</span>)),
        }
    }

    <span class="doccomment">/// Returns a mutable iterator over the local values of all threads.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Since this call borrows the `ThreadLocal` mutably, this operation can</span>
    <span class="doccomment">/// be done safely---the mutable borrow statically guarantees no other</span>
    <span class="doccomment">/// threads are currently accessing their associated values.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter_mut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">CachedIterMut</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">unsafe</span> { (<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">local</span>.<span class="ident">get</span>()).<span class="ident">as_mut</span>().<span class="ident">into_iter</span>().<span class="ident">chain</span>(<span class="self">self</span>.<span class="ident">global</span>.<span class="ident">iter_mut</span>()) }
    }

    <span class="doccomment">/// Removes all thread-specific values from the `ThreadLocal`, effectively</span>
    <span class="doccomment">/// reseting it to its original state.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Since this call borrows the `ThreadLocal` mutably, this operation can</span>
    <span class="doccomment">/// be done safely---the mutable borrow statically guarantees no other</span>
    <span class="doccomment">/// threads are currently accessing their associated values.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="ident">CachedThreadLocal</span>::<span class="ident">new</span>();
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">&gt;</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;
    <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">CachedIntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">CachedIntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">unsafe</span> { (<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">local</span>.<span class="ident">get</span>()).<span class="ident">take</span>().<span class="ident">into_iter</span>().<span class="ident">chain</span>(<span class="self">self</span>.<span class="ident">global</span>.<span class="ident">into_iter</span>()) }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>;
    <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">CachedIterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">CachedIterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">iter_mut</span>()
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Default</span><span class="op">&gt;</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Returns the element for the current thread, or creates a default one if</span>
    <span class="doccomment">/// it doesn&#39;t exist.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_default</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">T</span> {
        <span class="self">self</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">T</span>::<span class="ident">default</span>()))
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">&gt;</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;ThreadLocal {{ local_data: {:?} }}&quot;</span>, <span class="self">self</span>.<span class="ident">get</span>())
    }
}

<span class="doccomment">/// Mutable iterator over the contents of a `CachedThreadLocal`.</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">CachedIterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Chain</span><span class="op">&lt;</span><span class="ident">OptionIter</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="kw-2">mut</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span>, <span class="ident">IterMut</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">T</span><span class="op">&gt;&gt;</span>;

<span class="doccomment">/// An iterator that moves out of a `CachedThreadLocal`.</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">CachedIntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Chain</span><span class="op">&lt;</span><span class="ident">OptionIter</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span>, <span class="ident">IntoIter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;&gt;</span>;

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cell</span>::<span class="ident">RefCell</span>;
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::<span class="ident">AtomicUsize</span>;
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>;
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
    <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">ThreadLocal</span>, <span class="ident">CachedThreadLocal</span>};

    <span class="kw">fn</span> <span class="ident">make_create</span>() <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Fn</span>() <span class="op">-&gt;</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>);
        <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="kw">move</span> <span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">count</span>.<span class="ident">fetch_add</span>(<span class="number">1</span>, <span class="ident">Relaxed</span>)))
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">same_thread</span>() {
        <span class="kw">let</span> <span class="ident">create</span> <span class="op">=</span> <span class="ident">make_create</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tls</span> <span class="op">=</span> <span class="ident">ThreadLocal</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;ThreadLocal { local_data: None }&quot;</span>, <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">tls</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;ThreadLocal { local_data: Some(0) }&quot;</span>, <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">tls</span>));
        <span class="ident">tls</span>.<span class="ident">clear</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">tls</span>.<span class="ident">get</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">same_thread_cached</span>() {
        <span class="kw">let</span> <span class="ident">create</span> <span class="op">=</span> <span class="ident">make_create</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tls</span> <span class="op">=</span> <span class="ident">CachedThreadLocal</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;ThreadLocal { local_data: None }&quot;</span>, <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">tls</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;ThreadLocal { local_data: Some(0) }&quot;</span>, <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">tls</span>));
        <span class="ident">tls</span>.<span class="ident">clear</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">tls</span>.<span class="ident">get</span>());
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">different_thread</span>() {
        <span class="kw">let</span> <span class="ident">create</span> <span class="op">=</span> <span class="ident">make_create</span>();
        <span class="kw">let</span> <span class="ident">tls</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">ThreadLocal</span>::<span class="ident">new</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());

        <span class="kw">let</span> <span class="ident">tls2</span> <span class="op">=</span> <span class="ident">tls</span>.<span class="ident">clone</span>();
        <span class="kw">let</span> <span class="ident">create2</span> <span class="op">=</span> <span class="ident">create</span>.<span class="ident">clone</span>();
        <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">tls2</span>.<span class="ident">get</span>());
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="kw-2">*</span><span class="ident">tls2</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create2</span>()));
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">1</span>), <span class="ident">tls2</span>.<span class="ident">get</span>());
            })
            .<span class="ident">join</span>()
            .<span class="ident">unwrap</span>();

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">different_thread_cached</span>() {
        <span class="kw">let</span> <span class="ident">create</span> <span class="op">=</span> <span class="ident">make_create</span>();
        <span class="kw">let</span> <span class="ident">tls</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">CachedThreadLocal</span>::<span class="ident">new</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());

        <span class="kw">let</span> <span class="ident">tls2</span> <span class="op">=</span> <span class="ident">tls</span>.<span class="ident">clone</span>();
        <span class="kw">let</span> <span class="ident">create2</span> <span class="op">=</span> <span class="ident">create</span>.<span class="ident">clone</span>();
        <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">tls2</span>.<span class="ident">get</span>());
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="kw-2">*</span><span class="ident">tls2</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create2</span>()));
                <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">1</span>), <span class="ident">tls2</span>.<span class="ident">get</span>());
            })
            .<span class="ident">join</span>()
            .<span class="ident">unwrap</span>();

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="ident">tls</span>.<span class="ident">get</span>());
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="kw-2">*</span><span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">create</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">iter</span>() {
        <span class="kw">let</span> <span class="ident">tls</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">ThreadLocal</span>::<span class="ident">new</span>());
        <span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="number">1</span>));

        <span class="kw">let</span> <span class="ident">tls2</span> <span class="op">=</span> <span class="ident">tls</span>.<span class="ident">clone</span>();
        <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
                <span class="ident">tls2</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="number">2</span>));
                <span class="kw">let</span> <span class="ident">tls3</span> <span class="op">=</span> <span class="ident">tls2</span>.<span class="ident">clone</span>();
                <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
                        <span class="ident">tls3</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="number">3</span>));
                    })
                    .<span class="ident">join</span>()
                    .<span class="ident">unwrap</span>();
            })
            .<span class="ident">join</span>()
            .<span class="ident">unwrap</span>();

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tls</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">try_unwrap</span>(<span class="ident">tls</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">tls</span>.<span class="ident">iter_mut</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">x</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;&gt;</span>();
        <span class="ident">v</span>.<span class="ident">sort</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], <span class="ident">v</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">tls</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">x</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;&gt;</span>();
        <span class="ident">v</span>.<span class="ident">sort</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], <span class="ident">v</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">iter_cached</span>() {
        <span class="kw">let</span> <span class="ident">tls</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">CachedThreadLocal</span>::<span class="ident">new</span>());
        <span class="ident">tls</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="number">1</span>));

        <span class="kw">let</span> <span class="ident">tls2</span> <span class="op">=</span> <span class="ident">tls</span>.<span class="ident">clone</span>();
        <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
                <span class="ident">tls2</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="number">2</span>));
                <span class="kw">let</span> <span class="ident">tls3</span> <span class="op">=</span> <span class="ident">tls2</span>.<span class="ident">clone</span>();
                <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
                        <span class="ident">tls3</span>.<span class="ident">get_or</span>(<span class="op">||</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="number">3</span>));
                    })
                    .<span class="ident">join</span>()
                    .<span class="ident">unwrap</span>();
            })
            .<span class="ident">join</span>()
            .<span class="ident">unwrap</span>();

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tls</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">try_unwrap</span>(<span class="ident">tls</span>).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">tls</span>.<span class="ident">iter_mut</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">x</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;&gt;</span>();
        <span class="ident">v</span>.<span class="ident">sort</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], <span class="ident">v</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">tls</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">x</span>).<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;&gt;</span>();
        <span class="ident">v</span>.<span class="ident">sort</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], <span class="ident">v</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">is_sync</span>() {
        <span class="kw">fn</span> <span class="ident">foo</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">&gt;</span>() {}
        <span class="ident">foo</span>::<span class="op">&lt;</span><span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;&gt;</span>();
        <span class="ident">foo</span>::<span class="op">&lt;</span><span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;&gt;</span><span class="op">&gt;</span>();
        <span class="ident">foo</span>::<span class="op">&lt;</span><span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;&gt;</span>();
        <span class="ident">foo</span>::<span class="op">&lt;</span><span class="ident">CachedThreadLocal</span><span class="op">&lt;</span><span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;&gt;</span><span class="op">&gt;</span>();
    }
}
</pre>
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